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Use of a Solid Bismuth Drop Electrode in the Determination of the Drug Metronidazole
Jarošová, Johanka ; Vyskočil, Vlastimil (advisor) ; Fischer, Jan (referee)
The subject of the present Bachelor Thesis was the study of a new commercial solid bismuth drop electrode (SBiDE) and its use to find optimal conditions for the voltammetric determination of the drug metronidazole using the differential pulse voltammetry technique (DPV). The voltammetric behavior of the selected drug was studied as a function of pH of aqueous Britton-Robinson buffer (BR buffer) solution. BR buffer at pH 12 was chosen as the optimal medium for the determination of the drug metronidazole on SBiDE, in which the concentration dependence of metronidazole was measured in the range of 1×10−6 - 6×10−4 mol/L. The limit of quantification (LQ) was 1.38×10−6 mol/L and the limit of detection (LD) was 4.41×10−7 mol/L. The newly developed voltammetric method was used for the determination of metronidazole in the pharmaceutical forms Efloran infusion solution 500 mg/100 mL, Entizol 250 mg tablet, Entizol 500 mg vaginal tablet and Noridem infusion solution 500 mg/100 mL. The selected voltammetric method was compared with the analytical method by UV-VIS absorption spectrometry in the environment of aqueous BR buffer solution at pH 12 in the concentration range of metronidazole 2×10−5 - 8×10−5 mol/L.
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Utilization of Working Silver Solid Electrode for Voltammetric Determination of Drug Metronidazole
Mráček, Ondřej ; Vyskočil, Vlastimil (advisor) ; Fischer, Jan (referee)
This Bachelor thesis discusses the electrochemical behavior of metronidazole and seeks to find optimal conditions for the drug's voltammetric determination at a working silver solid electrode (AgSE) using differential pulse voltammetry (DPV). The voltammetric behavior of the drug was investigated, where the dependent variable was the pH of a water medium Britton-Robinson buffer (BRB). The optimum medium for voltammetric determination of metronidazole at a AgSE is a region of cathodic potential chosen to be the Britton-Robinson buffer, where the sodium hydroxide alkaline component (Na-BRB) has a pH of 10.0, and then measured further at voltammetric cell (volume of 10 ml) at concentration dependencies in the range of (1-1000)×10−6 mol/l. The limit of quantification (LOQ) and the limit of detection (LOD) were found to be 1.8×10−6 mol/l and 5.5×10−7 mol/l, respectively. In addition, the metronidazole was studied for the effect of electrochemical regeneration at the AgSE, where the parameters were: Nr = 150, Ein_r = 0 mV, Tin_r = 0.1 s, Efin_r = −1500 mV, Tfin_r = 0.1 s. The next section studies the electrochemical activity of the AgSE, which is not entirely ideal. The newly developed method might be applicable in the future for determining metronidazole through differential pulse voltammetry (DPV) to...
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